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k in (-oo:+oo)
9-2*k = (-2/3)*k+235/27 // - (-2/3)*k+235/27
9-2*k-((-2/3)*k)-(235/27) = 0
(2/3)*k-2*k-235/27+9 = 0
8/27-4/3*k = 0 // - 8/27
-4/3*k = -8/27 // : -4/3
k = -8/27/(-4/3)
k = 2/9
k = 2/9
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